Abrasive stick holder



Feb. 20, 1934. s. M. HERSHEY ABRASIVE STICK HOLDER Filed July 28, 1932INVENTOR. \Samue/ M Hers/z W A TTORNE Y.

Patented Feb. 20, 1934 PATENT GFFICE ABRASIVE s'rrox HOLDER Samuel MarkHershey, Bala, Pa., assignor to Albert P. De Sanno, Sr., Philadelphia,Pa.

Application July 28, 1932. Serial No. 625,297

2 Claims.

My invention relates to the mounting of abrading wheels upon mandrels orarbors.

Abrasive sticks or abrasive wheels used for grinding straight, taper orspiral reamers, milling cutters, taps, dies, valves, pistons, steelbrushings and hardened shafts, etc. ordinarily are'circular incross-section and are attached to a cylindrical arbor or mandrel byhaving a hole entirely through or partially thru its center. The arborpartially extending into the wheel is retained therein by cement orother analogous binding material. The cement gives no security becauseafter a short use the fastening means disintegrate causing theseparation of the arbor l5 and abrasive.

As it is relatively costly to replace the abrasive stick and arbor, whenseparation occurs, it is desirable to merely have a permanent arbor andsimply insert abrasive sticks in that arbor.

The present practice is to throw away, as obsolete, long abrasive stickswhich are only worn at one end, as such sticks can not have their usefulgrinding surface extended.

It is, therefore, an object of my invention to provide an abrasive stickholder which may be used indefinitely and which will readily hold anabrasive stick or wheel.

Another object of my invention is to provide an abrasive stick holdersuch that if the end of the abrasive stick is worn, the same abrasivemay be extended in the holder to utilize the grinding surface which hasnot been used.

Another object of my invention is to utilize a holder wherein theposition of the grinding surface of the abrasive stick may be readilyextended or shortened.

With the above objects in view, my invention consists of a holder forabrasive sticks having an arbor on which is mounted a plurality offlex-- 4o ible jaws to grasp the abrasive stick.

A further object of my invention is to construct a holder for a grindingwheel which wheel may be of various cross-sectional shapes such asround, elliptical, polygonal sections with irregular sides or starshaped sides.

Gther objects of my invention are to provide an improved device of thecharacter described, that is easy and economically produced, sturdy inconstruction and having a maximum efficiency.

With these and related objects in view, my invention consists in thefollowing details of construction and combination of parts as will befully understood from the following specification, when taken inconjunction with the accompanying drawing, in which:-

Figure 1 is an assembled side elevational view of a holder, embodying myinvention, retaining an abrasive stick;

Figure 2 is a perspective disassembled view of my holder;

Figure 3 is a fragmentary perspective view of the jaws of a modifiedholder; and

Figure 4 is a fragmentary side elevational view of the modified jaws.

Referring more specifically to the drawing, 1- show in Fig. l a solidcylindrical abrasive stick 10 having one end therein gripped by aplurality of flexible metal jaws 12 of a cylindrical holder.

The open ends of the jaws 12 have a series of tapered threads 14 cut onthe outside to enable a threaded knurled coupling 16 to compress thejaws as the coupling is turned upon the threads of the jaws. The jaws 12extend from a head or base 18 which has rigidly connected to it an arboror mandrel 20, the arbor or mandrel being adapted for easy insertion ina grinding chuck.

The holder shown in Fig. l is turned from a. solid body, and the threads14 are cut thereon. When the predetermined outside diameters have beenturned and the threads cut thereon, the threaded jaw end is interiorlydrilled and reamed to render the holder hollow for receiving andsupporting an abrasive stick therein. Slots 21 are then cutlongitudinally to the medial axis from the open end of the holder to thebase 18.

In Figs. 3 and 4 I show a modified cylindrical holder having a base fromwhich extends a plurality of flexible jaws 22 for grasping an abrasivestick. A slot 24 for completing a bayonet joint extends transversely tothe medial axis at the open cylindrical end of the abrasive holder. Theslot 24 terminates at one end in a short slot which is substantiallyparallel to the radial axis of the holder. A ring 26 has a radiallyextending stud 28 mounted on the interior surface of the ring. The stud28 is of such width and length that it will readily slide within itscomplementary slot 24 and the terminating short slot, in order that 100the jaws of the holder will be compressed or tightened about theabrasive stick when the ring 26 is inserted on the jaws. The ring withits stud 28 fitting in its complementary slot form a bayonet joint andenable a quick release of the abrasive 105 stick when the ring isremoved as the jaws expand, and a rapid tightening of the holder jawsabout the abrasive stick occurs when the ring is inserted on the holderjaws for locking the abrasive stick in position.

Altho this invention has been described in considerable detail, suchdescription is intended as illustrative rather than limiting, as theinvention may be variously embodied, and the scope of the invention isto be determined as claimed.

I claim:-

1. A holder for an abrasive stick comprising a hollow supporting memberterminating in a tapered end portion, said member being longitudinallyslitted whereby to render it compressible and said tapered end portionhaving a bayonet slot therein, and means fitted over said tapered endportion for compressing said tapered end to retain an abrasive sticktherein, said means including an element adapted to cooperate with saidbayonet slot to retain said means fitted over said tapered end.

2. A holder for an abrasive stick comprising a hollow supporting memberterminating in a tapered end portion, said member being longitudinallyslitted whereby to render it compressible and said tapered end portionhaving a bayonet slot therein, and a ring member fitted over saidtapered end portion for compressing said tapered end to retain anabrasive stick therein, said ring member including a stud adapted tointerfit in and cooperate with said bayonet slot to retain said ringmember fitted over said tapered end.

SAMUEL MARK HERSHEY.

